I did a "clean install" of 20.04 over 18.04 earlier this month keeping my home partition. In the process I discovered a 12GB unused partition at the end of the drive with my home partition. So I added it to fstab as root (as /data) because I wasn't thinking.Before changing ownership to myself in fstab I checked the contents expecting it to be blank. Turns out there is a directory snap.canonical-livepatch, but the date is shortly after the OS reinstallation (4 October) and it is empty.
Should I just leave the partition as is under root and forget about it, or can I mount this partition as myself and use it for myself (relatively) safely? There is already a snap.canonical-livepatch directory under the home directory for root.
EDIT: The comment by user535733 prompted me to check my existing /tmp directory (under the / mount point) and found the same files by name but newer. I realised that the "unused partition" had been mounted as a separate /tmp previously (under 18.04).So removing it won't cause any problems. I still don't know what will happen if I remount that "unused partition" as /tmp, as it already exists under /.